While cycling the ignition key from the key OFF/engine OFF position to the key ON/engine OFF position, the red brake light comes ON and then turns OFF. What could this indicate?

The indication that the red brake light comes on and then turns off while cycling the ignition key is typically consistent with the normal operation of the instrument warning indicators. When the key is turned to the ON position, the vehicle's electrical system performs a self-check that activates various warning lights, including the brake light. This is a standard procedure to verify that these lights function correctly. The light illuminating briefly confirms that the circuit is operational before turning off, which indicates that there is no fault with the brake system at that moment.

This behavior contrasts with scenarios suggesting a malfunction or issue, such as with the brake system, ignition switch, or brake light switch, which would typically present more persistent warnings or symptoms if there were actual problems.